Machine for grooving chair-seats



(No Model.) 2 .2 SheetsSheet 1. D. SCANLAN. MACHINE FOR GROOVING CHAIRSEATS.

No. 452,922. Patented May 26, 1891.

me NDRRIS PEYERS co., mow-mum, WASHINGTON, n. c.

(No Monet.) 2 Sheet.s-Sheet 2.

D. SCANL'AN.

MACHINE FOR GROOVING CHAIR SEATS.

No. 452,922. Patented May 26,1891.

UNITED STATES PATENT ()EEIcE.

DAVID SCANLAN, OF ASI'IBURNI'IAM, ASSIGNOR OF ONE-HALF TO A. D. \VAY-MOTH & (70., OF FITOHBURG, MASSAGH TBETTS.

MACHINE FOR GROOVING CHAIR QSEATS.

SPECIFICATION forming part Of Letters Patent No. 452,922, dated May 26,1891. Application filed December 31, 1890- Serial No. 376,417. (Nomodel.\

To ctZZ whom it may concern:

Be it known that 1, DAVID SGANLAN, of Ashburnham, in the county ofWorcester, State of Massachusetts, have invented certain new and usefulImprovements in Machines for Grooving Chair-Seats, of which thefollowing is a description sufficiently full, clear, and exact to enableany person skilled in the art or science to which said inventionappertains to make and use the same, reference being had to theaccompanying drawings, forming part of this specification, in which- IFigure 1 is a front elevation of my improved machine for groovingchair-seats; r 5 Fig. 2, an end elevation of the same; Fig 3, a top planview; Fig. 4:, a transverse section of the chair, table, and pattern;Fig. 5, a sectional elevation illustrating the table-actuatingmechanism, and Fig. 6 a like view showin g details of theelutch-releasin g mechanism.

Like letters and figures of reference indicate corresponding parts inthe different figures of the drawings.

My invention relates especially to a ma- 2 5 chine for grooving theframe of a chair-seat to receive the wooden strip for binding the caneseat thereto; and it consists in certain novel features hereinafterfully set forth and claimed, the object being to produce a sim- 3o pler,cheaper, and more effective device of this character than is now 1nordinary use.

The nature and operation of the improvement will be readily understoodby all conversant with such matters from the following 3 5 explanationIn the drawings, A represents the bed or standard of the machine, inwhich a horizontal shaft Z) is journaled, said shaft bearing a loosedrive-wheel cl at one end and a pinion fat its opposite end. Aspring-separated clutch mechanism H of ordinary construction is actuatedbya horizontal lever 50,

. which projects through the front of the body A and by which the pulley(Z may be made fast to the shaft. .At each end of the bed a standard gis arranged vertically, said standards being connected at then tops andbottoms by a crossbar h, which are slotted 1ongitudinally at 51. Twovertically-arranged 5o rods i are laterally adjustable, respectively,

the lever 57.

in said slots, and are provided with rotatable. sleeves j. Aright-angled arm B is mounted on the sleeves j of each rodt, whichserves as a pivot therefor. In the free end of each of said arms arotary chuck p is arranged vertically and are adapted, respectively, toreceive a grooving tool or bit.

A horizontal table D is mounted on a vertical rotary shaft t, journaledin the front of the machine, said table conforming periph- 6o erally tothe shape of the chair-seat. The table is provided with clamps c forsecuring said seat to the upper face thereof and on its under side withlugs 52. (See Fig. 4:.) Apattern r, conforming peripherally to the shapeof the groove to be formed in the chair-seat, is attachable to said lugsby screws 54. It is designed to employ a series of said patterns ofdifferent sizes interchangeable on the table. Ahorizontal guide-screwwpasses through the lower end of each arm B and contacts with the edge ofthe pattern 1'. Cords 3 have an end respectively secured to the oppositearms B and pass over pulleys .2, their opposite ends being provided withweights 15. The purpose of said cords and weights is to hold theguide-screws win contact with the edge of the pattern 0, so that thebits in the chuck 19 shall be guidedthereby to form a groovein the seat,conforming in outline to said pattern. The table-spindle t is fitted toslide vertically in its bearings 55 and 56, and a beveled gear 16 issplined thereon. A stub-shaft 17 on the body A has a beveled pinion 18meshing with said gear 16. A large gear 19 on said stubshaft meshes withthe pinion f on the driveshaft. A horizontal shaft 20 is journaled onthe bed and bears a gear 21, meshing with a pinion 22 on saidstub-shaft. A sleeve 25 on the shaft 20 bears a cam 26.

A horizontal lever 57 passes centrally through the frame A above the cam26, and is pivoted at 58 (see Fig. 5) to a pendent lever 59, pivotedwithin said bed. A treadlelever 60 passes centrally through the frameand is pivoted at the rear thereof. A rod 61 connects said treadle withthe inneizend of The cam 26 is provided with a radial slot 62. (See Fig.5.) The outer end of the lever 57 is forked or provided with IOO cars63, in which a plate 64:, normally resting in the cam-slot 62, ispivoted. Said plate is provided with a vertical spindle 65, which playsin the bearings 55 (see Fig. 5) and forms a step on which thetable-spindle t rotates.

On the inner end of the cam-shaft 2O acam 28 is mounted. A link 66 playsloosely on the shaft 20 between the cam 28 and shaftbox 68, said linkbeing provided with a stud 67 (see Fig. 6) in position to be engaged bysaid cam and forced downward. The link is provided with arod 7 O, whichslides vertically through a box 71, secured to the bed A below the lever50. A coiled spring 72 (see Fig. 6) within said boX acts expansively toforce said rod upward. The lever 50 normally rests on the top of the rodwhen the clutch H is disengaged, and is provided with a notch or rabbet7 3, (see Fig. 6,) into which said rod is projected by its spring tolock said lever when moved to engage said clutch. The face of the cam 26is divided into three tracks, which consecutively increase in depth. Thegears are timed to impart two complete rotations to the table to onerotation of said cam. In use the seat-frame issecured to the rotarytable D by the clamps n. The guide-screws win the arms B are set so thatthe grooving-bits in the chucks 19 will engage said seat-frame in theproper place, and are held in engagement with the pattern 4 by theweighted cords, as described, the arms 13 swinging freely on theirpivots. The lever 50 is moved from left to right, as viewed in Fig. 1,setting the spring-clutch H and imparting motion to the drive-shaft. Atthe same time the spring 7 2 forces the rod into the notch 7 3 andlocking said lever to prevent the clutch-spring disconnecting saidclutch. The treadle 60 being depressed, the plate 64; is elevatedthereby sufficiently to take it outof the cam-slot 62 to rest on theface of said cam. This upward movement of the plate forces thetablespindle t upward and the seat on the tableD into engagement withthe grooving-tools in the chucks p. Said chucks are connected with powerand rotated in any suitable manner. The gears are so timed that when thetable is forced upward by the treadle against the bits it makes a half-revolution while thus engaged, a second half occurring while being fedby the first cam-track. There being two boring-tools, the respectivegrooves formed thereby meet at the end of a halfrevolution of the table.Tracks act on the table consecutively during its second revolution,gradually feeding the chair-seat against the bits in a manner which willbe readily understood by all conversant with such matters. At thecompletion of a revolution of the cam 26 the plate 64 drops into thecamslot 62, permitting the table to fall away from the bits sufficientlyto remove the seat. At the same time the cam 28 engages the stud 67 onthe link 66, forcing said link downward and freeing the lever 50, sothat the spring of the'clutch I-I may act to disconnect the same andloosen the pulley'd, stopping the machine.

Instead of cords and weights, springs may be employed for holding theguides in engagement with the pattern-table.

Having thus explained my invention, what I claim is 1. In a machine forgrooving chair-seat frames, the combination of a pattern-table mountedon a rotary sliding shaft geared to the driving-sh aft, a feed-camactuated by said driving-shaft for intermittently moving the table-shaftlongitudinally, treadle-released locking mechanism for said cam, armsmounted to swing on the machine-frame and bearing the grooving-tools,adjustable guides on said arms peripherally engaging the pattern, and atension mechanism for said arms, arranged to operate substantially asdescribed.

2. In a machine for grooving chair-seats,

the combination of a body, a drive shaft and pulley, a spring-clutchtherefor, a horizontal stub-shaft, a vertically-sliding shaft gearedthereto, a pattern-table on said sliding shaft, a shaft geared to thestub-shaft and bearing a feed-cam for engaging the sliding shaft, armsfitted to swing horizontally on the frame and bear grooving-tools,mechanism actuated by a cam on the cam-shaft for freeing said clutch,and a tension for holding said arms in engagement with thepattern-table, substantially as described.

3. In a machine for grooving chair-seat frames, a drive-shaft, loosepulley, and springclutch mechanism, in combination with a rotarypattern-table mounted on a sliding shaft, locking mechanism for saidclutch, and mechanism for automatically feeding said shaftlongitudinally and releasing said clutch, substantially as described.

4:. In a machine for grooving chair-seat frames, the rotarypattern-table mounted on a sliding shaft, in combination with atreadleactuated step for said shaft, and a cam for feeding said shaftand provided with a slot adapted to receive said step, substantially asand for the purpose set forth.

5. In a machine for grooving chair-seat frames, the rotary patterntableand sliding shaft, in combination with a treadle-actuated step therefor,the cam-shaft bearing the feedcam 26, providedwith the slot 62 forreceiving said step at a complete revolution of said cam, substantiallyas and for the purpose set forth.

In a machine for grooving chair'seat frames, theswin gin g chucks andtension mechanism, in combination with the sliding rotary table, afeed-cam therefor, and a treadle-actuated step for the table-shaftfitted to enter a slot in said cam, substantially as described.

7. In a machine for grooving chair-seat frames, the drive-shaft, pulley,and springwhen set, and a cam for releasing said clutch clutch, incombination with the rotary slidat the completion of a revolution of thefeeding pattern-table, a treadle-aetuated step cam, substantially asdescribed.

therefor, a cam-shaft actuated by the driv- DAVID SOANLAN. 5 ing-shaft,a feed-cam thereon provided with \Vitnesses:

a slot for receiving said step, a spring-pushed CARROLL Z. PARKER,

link on the cam-shaft for looking said clutch I F. O. OURRIN.

